The top two riders of the Rolex Kentucky Three-Day Event switched places after Saturday's cross-country phase, but international dominance of the race continued.
Australia's Lucinda Fredericks on Headley Brittania edged in front of Germany's Bettina Hoy on Ringwood Cockatoo with a clear round. Hoy had 9.6 time faults in cross country after leading decisively in the dressage phase on Friday.
U.S. rider Buck Davidson continued in third place with My Boy Bobby after a clear round with no jumping or time faults.
The competition will finish Sunday at 1 p.m. with the stadium jumping phase.
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The cross-country course, designed by Mike Etherington-Smith, appeared to ride well under beautiful blue skies and a stiff breeze watched by a crowd of 40,600. That was down about 10,000 from last year, perhaps because of the economy, organizers speculated.
In cross country, the riders compete over 30 jumps at a speed of about 22 miles an hour. They have to complete the course within 11 minutes and two seconds.
There were several new jumps and combinations this year, which riders said were tough but fair.
Fredericks said she had some problems negotiating the famed Head of the Lake combination because Headley Brittania was so strong.
"She's so strong and quite difficult to manage," Fredericks said. "She just motored, and I had a fantastic ride over the second half of the course."